For the Z170 platform, ASUS is slowly increasing the number of Republic of Gamers motherboards available. Alongside the seniors Gene/Formula/Extreme, we have the Impact as a junior, sophomore models in Ranger and Hero but freshman in the Pro Gamer pair, the Extreme/Assembly, the Aura, and potentially more models down the line. Like a stick of seaside rock, ROG runs through the middle, with bits and pieces of the feature set ending up on different models. For this review, we look at the newest version of the Impact built for Skylake, the mini-ITX small motherboard line that has historically set a high standard for small PC builds.

100-Series:

To read specifically about the Z170 chip/platform and the specifications therein, our deep dive into what it is can be found at this link.

ASUS Maximus VIII Impact Z170 ROG Overview

There are a few well-known traits that the Impact motherboard line promotes, and anyone following the industry will recognize them. Unique to mini-ITX, the Impact line has a common theme of daughterboards for power delivery, semi-external audio (which is even unheard of on any size motherboard outside of the Impact without a separate PCIe card), and an effort on the hardware/software such that it still offers many features of the full sized ROG motherboards in the smaller form factor. They are as expensive as mini-ITX motherboards tend to get (save the mini-ITX on X99), stretching well into the territory of mid-to-high prices for full sized ATX motherboards.

Perhaps unsurprisingly, the new Maximus VIII Impact follows the same traits, and this particular brand in ROG could potentially leave ASUS scratching their heads as to how to improve on a design which has historically performed very well when we look at our previous data. It has been mentioned to us in the past that the motherboard manufacturers are aware of other companies reverse engineering each other’s ideas and implementing them the generation after, thus making the original idea no longer unique. But the Impact line remains strong - no-one has copied the right angled power attached design, nor the separate audio card, nor the rear-IO panel for two-digit debug and extra functionality, nor the extra fan extension card. Perhaps the mini-ITX motherboard market only has room for one premium player (although I find the hard to believe), but when you're the only one heading a specific niche, the requirement to innovate further is less of a concern as long as your target market is happy.

Semantics aside, the Maximus VIII Impact has one new issue to solve thanks to the introduction of the Z170 chipset - with 20 PCIe lanes from the chipset to use and abuse, the already jam packed design has to fit in more of the functionality similar to the rest of the 100-series line, such as USB 3.1 controllers, PCIe storage support with RAID, and others. To a certain extent the Impact is successful in this, although as mini-ITX boards tend to showcase, you only get 'one of each'.

The features on the Impact start with the usual set: daughterboard based power delivery, SupremeFX audio on a separate add-in card, Intel networking, 2x2 dual band 802.11ac Wi-Fi supporting MU-MIMO, rear-IO based troubleshooting tools and support for additional fan headers via the fan extension card. New to the scene are USB 3.1 ports, one Type-A and one Type-C, supported through Intel's Alpine Ridge controller. Use of the AR controller typically indicates future Thunderbolt 3 support, but ASUS has told me this will not be the case on the Impact. The rear panel also has a U.2 port for PCIe based 2.5 inch storage, which at this point means only Intel's SSD 750, but at least they haven't stretched to the defunct SATA Express standard.

Performance of the Impact in most key areas makes it hard to ignore - a super low DPC latency is one of the lowest we have ever seen. Our test BIOS did come with MultiCore Turbo enabled but power consumption is particularly light compared to other MCT motherboards, and it comes with a good Mini-ITX audio response due to the configuration. POST times are long at over 22 seconds, but our overclocking results were impressive with 4.7 GHz being very comfortable and even hitting 4.9 GHz at high voltage.

ASUS typically pushes the user experience of their BIOS and software packages, both of which get iterative updates on the last generation involving compatibility with the new chipset, USB 3.1 Turbo and a push into RAMDisk/RAMCaches now that we can get 16GB of DRAM per module, making the Impact support of up 32GB of overclocked memory.

ASUS Maximus VIII Impact Z170 ROG Overclocking

Experience with ASUS Maximus VIII Impact Z170 ROG

The overclocking methodology from ASUS comes in several formats. Most of the larger ASUS motherboards have a Turbo Power Up switch with two overclock modes, but for the Impact this is moved into the BIOS as an option under ‘TPU’.

When in LN2 mode, the BIOS will open up more extreme overclocking features for those who want to take it sub-zero.

In the OS, the standard options manifest in the TPU option in the AI Suite software, giving manual control tools or the 5-Way Optimization method for frequency, power, fans and other components of the system. This has a number of options relating to max temperatures and voltages the user wants to support.

Methodology

Our standard overclocking methodology is as follows. We select the automatic overclock options and test for stability with PovRay and OCCT to simulate high-end workloads. These stability tests aim to catch any immediate causes for memory or CPU errors.

For manual overclocks, based on the information gathered from previous testing, starts off at a nominal voltage and CPU multiplier, and the multiplier is increased until the stability tests are failed. The CPU voltage is increased gradually until the stability tests are passed, and the process repeated until the motherboard reduces the multiplier automatically (due to safety protocol) or the CPU temperature reaches a stupidly high level (100ºC+). Our test bed is not in a case, which should push overclocks higher with fresher (cooler) air.

Overclock Results

Overall, the nature of Skylake makes our CPUs comfortably get 4.5 GHz to 4.7 GHz on air/water without much issue. The Impact gets a very nice result with our CPU #3, sitting happy at 4.7 GHz for only 1.300 volts set in the BIOS.

Ehhhh, being able to quickly diagnose a post failure is more useful to me than not needing a USB hub. Not many people have more than 1-2 high bandwidth devices connected, but even if they did, you also have the USB3.1 port at the top that you could run your 3.0 hub through with minimal impact. Also there is a usb3.0 header so there should be 2 more ports available to you, if your case doesn't have connectors you can always just just by a header to dual usb connector.Reply

Thank you for in-depth review! Sadly Asus is still repeating its old mistakes. First is 3-jack audio. Second, lacking in back USB department. Third, why they try to push DIMMs in premium (read: packed) form factor? SO-DIMMs would allow either dual channel or more space. M2 port is missing, nobody uses and will use U2. M.2 disk should be on the bottom side of board. Board lacks USB 2.0 ports (not everything works on 3.0, sadly). And while I'm personally baffled by people using wireless network on desktop computer, 2x2 is just a waste. For this price either include solid 3x3, or none at all. This board tries, tries, but lacks in every aspect it tries to conquer.Reply

Does any mITX motherboard out there currently fit your requirements? I agree M.2 is a glaring ommission, but a world without wireless is a disaster even on a desktop PC, and especially on a mITX motherboard where I/O ports are constrained. Reply